Malicious PDF — malware analysis report

Static analysis result for SHA-256 7821befc9ae21071…

MALICIOUS

PDF

34.9 KB Created: 2020-09-30 15:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-16
MD5: d3b5ac804067ab495aca33ba3a445024 SHA-1: 09981291fa427fe82443855861639e639a8a5dad SHA-256: 7821befc9ae2107118ee2b8e16e775590d23d07ee0a26cfa4ba09eeae2e7c2ef
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=bd+chaurasia+human+anatomy+for+dental+students+pdf In PDF document text
    • https://site-1036694.mozfiles.com/files/1036694/jibubekozagazipenufedem.pdfIn PDF document text
    • https://site-1036944.mozfiles.com/files/1036944/dukezizo.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/35072816953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8216/1832/files/android_get_phone_number_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1820/2521/files/th350_kickdown_cable_adjustment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/59734809008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4367/5560/files/tolapowokamosukawiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/90296316110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9168/1699/files/dr._collins_pcat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6037/4937/files/zepuxufoladig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8511/3765/files/kakazudadolivekirusawas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3059/9064/files/43731763655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/future_maker_products_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/79940284980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/alchemy_level_guide_skyrim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4893 5544 bytes
SHA-256: 89315ef312d6a48f0e08263db11185ae97bbd09d7b2410004c3b058b125a9ad9
font_01_sfnt_off00005b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B51 9616 bytes
SHA-256: 106113dbe22df8dbecebe4df6c712fe96d6c811e77b1a677e5ed02daa46b2de2

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